Ignore Eternal Sonata's review, and prepare to play one of history's forgotten classics. Unlike other FPS's from the same era, this game does NOT reward a blast-everything mentality (not initially anyway, not until you pick up some beefier weapons than the pistol). The emphasis here is on subtlety, finesse....and THEN applying a shotgun right to the back of someone's poor sap's skull. Keep your weapon holstered, TALK to people, find out what they know - they might just be able to help you out...
This game is a much a precursor of the genre-defining Deus Ex as any of the System Shock or Thief games were and, while inelegant by modern standards (I believe the game ran on the old Quake 2 engine), it is still a fascinating and deeply enjoyable look back at the evolution of one of gaming's strongest genres. The sense of place and culture is also highly impressive, the use of gratuitous language and adult themes foreshadowing the controversial GTA: San Andreas in many ways.
Pay no heed to the two unbelieveable 1-star scores here, this is a game you owe it to yourself to check out.